AC1200 vs. WRT54G with "faster" cable modem

I use a Wireless-G 2.4GHz router model WRT54G which I have had for 5 to 6 years.  My Time Warner Cable Co. recently sent me an "improved" modem with 2 freqs. 2.4 and 5.0 GHz and promises download speed up to 100 Mbps and upload 10Mbps.  My old cable modem ran bench speeds of about  21 Mbps download and  2.21 Mpbs upload.  Replacing the old cable modem improved the speed test to 51.35 Mbps download and 11.02Mpbs upload.  My question is would replacing my WRT54G router with an AC-1200 Smart Wi-Fi router improve my speed even more or would any increase be negligible?  Thanks for your input.

k, yup. thats a 802.11n router/modem or gateway. so it depends on what you are going to connect to it as to whether or not it will be 'faster' for you. one suggestion is to run your test on a wired pc to see what speeds you are getting now. plug a pc into one of the ports and run the speedtest.com test from there. It should be about whatever they tell you you are paying for. If your devices are not capable of connecting at the higher AC speeds then buying a new router won't do much for you. also if you decice on going with a new AC router you would be best to make sure that they will allow you to put that gateway into bypass mode or modem only mode. It will make connecting the router easier. If you still have that 54g router powered on you may want to turn it off as it may be slowing down your wireless connection. Try to connect to the ssid that is from the new gateway and test that as well. 

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